That works perfectly as initially required; i have something additional that has only just reared it's head to this; any chance you can show me how i can combine this idea but set more precisely where i put the value of the (#idBox) textbox? I'm thinking subString sort of thing but essentially my option value code looks as follows:

<option value="(1 month) {75.00}">1 month - £75.00</option>

The {75.00} is needed for the shopping cart but if i use the a code above it adds the (#idBox) value at the end and the shopping cart for some annoying reason needs the {75.00} to be the last thing in the option value code.

I'd like to be able to set the addition of (#idBox) value to be 9 characters in from the end (ie before the {75.00}.

I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX.
The logical flow for the problem should be:
Write an event handler for the first drop down box to get …

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The viewer will learn the basics of jQuery including how to code hide show and toggles.
Reference your jQuery libraries:
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Include your new external js/jQuery file:
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Write your first lines of code to setup your site for jQuery…